UC560 teleworker with 857 router

[lyle.stevens]

We are trying to establish a site-to-site VPN connection between a UC560 and a 857 router.  The UC560 is connected to the internet via DSL and the 857 is connected to the internet via DSL.  We used the VPN server page in CCA to configure the UC560. We have a Cisco 7975 connected to the 857 router.  The VPN is established and the phone registers and is able to make a call, but after the call is established, there is no voice stream (can't hear anything on the handset) than once we terminate the call the set will be reboot.

Does anyone have any idea?  The configs are attached.

[ADAM CRISP · Accepted solution]

Hi Lyle.

You'll struggle to get SCCP working behind NAT.

You can try however to configure your 857 to request Network extension mode.

If you have more that one Teleworker, you'll have to ensure they have difference IP subnets.

see

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a0080808395.shtml

on the 857 add 'mode network-extension' to the ezvpn configration section.

Adam

[lyle.stevens]

Thank you for the help.